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RDBMS-无法弄清楚该表的位置

[英]RDBMS - Can't figure out where to place this table

原文 2015-12-14 13:45:23 5 1 mysql/ sql/ schema/ rdbms/ argouml

I've got a few days left before I need to hand in my relational database and everything's going alright. 我还需要几天时间才能提交我的关系数据库，一切都很好。 I have the database itself built but there's one design issue that I just can't figure out. 我已经建立了数据库本身，但是有一个设计问题我根本无法弄清楚。

I need a results table, one that references the Members and the Competitions table but I already have a link table there. 我需要一个结果表，该表引用了Members和Competitions表，但是我已经有了一个链接表。 I'm pretty sure I've simply managed to mislead myself but hope you guys can help! 我敢肯定，我只是设法误导了自己，但希望你们能提供帮助！ :) :)

Since I'm an awkward 2 points away from being able to post an image, an imgur link to the schema itself is located here: http://imgur.com/mgKaQql 由于我距离能够发布图像还有2个尴尬的地方，因此指向架构本身的imgur链接位于： http ://imgur.com/mgKaQql

1 个解决方案

Looking at your tables, I think you are looking for either 看你的桌子，我想你正在寻找

joining Members-Competitions to Competitions-Prizes, which would give the explicit relationship between the member and the prize that they won in that competition, (This is creating a Members-Competitions-Prizes "link" or relation) 加入“会员竞赛”到“竞赛奖”，这将使成员与他们在该竞赛中赢得的奖金之间具有明确的关系（这是在创建“会员竞赛”奖的“链接”或关系）

or 要么

adding an attribute to the Members-Competitions relation that would show that members placement in the competition regardless of whether they won a prize. 在“成员-竞赛”关系中添加一个属性，该属性将显示成员在竞赛中的排名，无论他们是否赢得奖品。 (This is creating a new column in the Members-Competition link/relation) （这将在“成员竞争”链接/关系中创建一个新列）

You choice will depend on what you expect to do with the information. 您的选择将取决于您对信息的期望。